SK281838B6 - Bleaching agent, its use and preparation containing it - Google Patents

Abstract

The invention relates to particles comprising a peroxy compound with capability of realeasing hydrogen peroxide or peroxy acids in aqueous solutions and an amino acid of the formula (HOOC)2N-CnHmCOOH-R in which R is H, CH2OH OR CH3, n is 1, 2 or 3 and m is 0-2n; or a salt thereof. The invention also relates to use of the particles and a composition comprising such particles.

Description

Technical field

The invention relates to particles comprising a peroxy compound and a C 5 -C 10 dicarboxylic acid or salt thereof, capable of releasing hydrogen peroxide or peroxyacid in aqueous solutions and suitable for use as detergent builders.

BACKGROUND OF THE INVENTION

Powdered detergent compositions often contain peroxy compounds which are capable of releasing hydrogen peroxide or peroxyacid in aqueous solutions. However, many peroxy compounds are not storage stable. It is believed that their decomposition is catalyzed by metal cations, moving relatively freely through water, generally contained in detergents, but also facilitated by an alkaline pH (typically about 8 to about 12) and by the action of other ingredients usually contained in detergents, such as for example zeolites or bleach activators, for example tetraacetylethylenediamine (TAED), tetraacetylglucoluril (TAGU) or pentaacetylglucose (PAG).

In view of the production of environmentally friendly detergents, it is desirable to use alkali metal carbonate peroxyhydrate, commonly known as peroxycarbonates, as bleaching agents. However, the peroxycarbonate activity in the detergent decreases rapidly due to decomposition when the detergent is stored under normal room temperature and humidity conditions.

Numerous attempts have been made to stabilize percarbonates, for example by mixing or coating with stabilizing compounds such as sulfates, carbonates, borates, silicates or organic compounds. Such stabilization methods are described in the patent literature. For example, British Patent Specification GB 1466799, GB 1538893, GB 1575792, European Patent Specification No. 459625, US Patent Specification No. 3975280 and European Patent Specification No. 573731 are disclosed.

U.S. Pat. No. 4,075,116 describes a process for preparing peroxycarbonate from sodium carbonate, hydrogen peroxide, and various additives.

Swiss Patent No. 659082 discloses blending bleaching agents with a high amount of inorganic carbonates and water-soluble acids to increase solubility.

Japanese Published Application (Kokai) Sho 58-74508 discloses mixing peroxycarbonate with silicate and phosphate, borate, citrate, tartrate or sodium succinate to increase solubility.

U.S. Pat. No. 5,340,496 discloses a method of stabilizing peroxycarbonate with certain combinations of inorganic salts and carboxylic acids, especially long chain acids, such as oleic acid.

The invention is directed to the production of particles containing a peroxy compound, in particular an alkali metal percarbonate with improved stability, especially in detergent compositions. The invention also relates to particles containing a peroxy compound and only those which are environmentally friendly.

SUMMARY OF THE INVENTION

Particles containing a peroxy compound capable of releasing hydrogen peroxide or peroxyacid in aqueous solutions consist of up to 15% by weight of dicarboxylic acid having 5 to 10 carbon atoms or a salt thereof according to the invention. Preferably, the particles according to the invention contain up to about 10% by weight, and in particular up to about 5% by weight, preferably water-soluble dicarboxylic acid having 5 to 10 carbon atoms or a salt thereof. The particles of the invention preferably contain more than about 0.01% by weight, and most preferably more than about 0.05%, of such a dicarboxylic acid or salt thereof. The amount by weight of the peroxy compound in the particles is suitably about 10 to about 99%, preferably more than 50% and especially more than about 95%. The dicarboxylic acid may be mixed with and / or applied to the peroxy compound as a coating.

The term "about" always means that the amount is reasonably around the stated value, that is, it replaces "± x".

The dicarboxylic acid is believed to act as a chelating agent, but it has surprisingly been found that the dicarboxylic acid of the invention provides better storage stability than conventional non-biodegradable chelating agents such as ethylenediaminetetraacetic acid (EDTA). However, too high a concentration of dicarboxylic acid or salts thereof may reduce thermal stability, especially at high concentrations of peroxy compounds.

It is preferred to use alkali metal or alkaline earth metal salts of dicarboxylic acids. The alkali metals are preferably selected from sodium, potassium and mixtures thereof, and the alkaline earth metals are preferably selected from calcium, magnesium and mixtures thereof. Sodium salts are particularly preferred. In the following description, carboxylic acids are also understood to include their salts.

The dicarboxylic acids suitably contain 5 to 8 carbon atoms and in particular 5 to 7 carbon atoms. Preferably, the carboxylic acid groups are located at the ends of the hydrocarbon chain. The dicarboxylic acid preferably does not contain hydroxyl groups, and in particular does not contain functional groups except carboxyl groups. The most preferred carboxylic acid has the formula (I)

COOH-R-COOH (I) wherein R represents an alkylene group which is preferred or an alkenylene group having from 3 to 8 carbon atoms, preferably from 3 to 5 carbon atoms. Preferably R is a straight chain group without branching.

Examples of dicarboxylic acids are glutaric, adipic, pimelic, suberic, azelaic, sebacic and mixtures thereof, with glutaric, adipic and pimelic acids being particularly preferred. Glutaric acid is most preferred.

The particles of the invention may contain two or more dicarboxylic acids. They may also contain other environmentally acceptable stabilizers or inert substances.

The particles preferably contain a silicate, which further improves stability and also supports mechanical strength. The silicate may be mixed with the peroxy compound and / or used as a coating. Preferably, at least a portion of the silicate is mixed with the peroxy compound. The silicate is suitably an alkali metal silicate, in particular sodium, potassium or mixtures thereof, especially sodium. The molar ratio of SiO ₂ : M ₂ O, where M is an alkali metal, is preferably about 1 to about 3, most preferably about 1 to about 2.5. Suitably, the particles comprise about 0.1 to about 20% by weight, preferably about 0.2 to about 15%, and most preferably about 0.5 to about 10% sodium silicate. It has been found that stability is further improved if:

The particle comprises a water-soluble magnesium compound, preferably magnesium sulfate. The magnesium compound may be mixed with the peroxy compound and / or applied as a coating. Preferably, at least some of the magnesium compound is mixed with a peroxy compound, most preferably together with an alkali metal silicate. The particles preferably contain from about 0.01 to about 5% by weight, and most preferably from about 0.1 to about 3% by weight of magnesium in the form of magnesium sulfate.

It has also been found that a synergistic effect is obtained when the particle also contains a chelating agent selected from the group consisting of a hydroxycarboxylic acid of formula (II)

R ' _Cn H _m (OH) _n COOH (II), where is

R ^{1 is} CH ₂ OH or COOH, n 2 to 6 and 0 to n or a salt thereof.

It is preferred to use the hydroxycarboxylic acid of formula (II) in the form of its alkali metal or alkaline earth metal salt thereof. The alkali metal is preferably sodium, potassium and mixtures thereof, the alkaline earth metal is preferably calcium, magnesium and mixtures thereof. Sodium salts are particularly preferred. In the following description, hydroxycarboxylic acid is also to be understood as a salt thereof.

The particles of the invention preferably contain from about 0.01 to about 15% by weight, more preferably from about 0.01 to about 10%, and in particular about 0.05 to about 5%, of the hydroxycarboxylic acid of formula (II). The weight ratio of dicarboxylic acid to hydroxycarboxylic acid is preferably about 0.05: 1 to about 4: 1 and most preferably about 0.1: 1 to about 1: 1. The hydroxycarboxylic acid may be mixed with and / or applied to the peroxy compound as a coating.

In formula (II), R 'is preferably CH ₂ OH. It is also preferred that n is 4 or 5. Preferably, m is the same as n or n-2, wherein the hydrocarbon chain is saturated or contains one double bond. A particularly preferred hydroxycarboxylic acid salt of formula (II) is an alkali metal glucoheptonate (R ¹ is CH 2 OH, n 5). Other preferred hydroxycarboxylic acid salts of formula (II) are alkali metal gluconate (R ¹ is CH 2 OH, n m 4) and alkali metal ascorbate (R 1 is CH ₂ OH, n 4 and m 2). Other useful hydroxycarboxylic acids of formula (II) are, for example, trihydroxyglutaric acid, tartaric acid or saccharin. It will be appreciated that the particles of the invention may contain one or more such hydroxycarboxylic acids.

The particles of the invention have high stability when uncoated, but the highest stability is generally achieved when the particles are coated. Such a coating may comprise, for example, at least one dicarboxylic acid, as previously described, hydroxycarboxylic acids, as previously described, alkali metal silicate, a water-soluble magnesium compound, for example magnesium sulfate, alkali metal carbonate, bicarbonate or sulfate, or environmentally friendly organic chelating agents; the different components are applied as one or several layers.

According to one embodiment of the invention, the dicarboxylic acid already described is contained only as an admixture with the peroxy compound, while the hydroxycarboxylic acid already described is contained in its coating or vice versa.

Thus, according to another embodiment of the invention, the dicarboxylic acid already described, as the hydroxycarboxylic acid already described, is admixed with and / or contained in a peroxy compound.

The particles preferably have an average diameter of about 50 to about 3000 µm, preferably about 100 to about 1600 µm. The preferred density is about 600 to about 1500 g / l, especially about 800 to about 1100 g / l. It has been found that high density as well as large mean particle size improves storage stability.

The invention is particularly advantageous when the peroxy compound is an alkali metal percarbonate, but other peroxy compounds may also be stabilized, for example, alkali metal salts of perborate, peroxosulfates, peroxyphosphates or peroxysilicates, peroxycarboxylic acid or peroxycarboxylic acid releasing compounds such as diacylated diperoxycarboxylic acid WO 91/17143).

The particles of the invention can be prepared by known methods. The components to be mixed with the peroxy compound are preferably added to the granulation step, but may also be incorporated directly when, for example, alkali metal percarbonate is produced from alkali metal carbonate and hydrogen peroxide. If an alkali metal silicate is to be incorporated, it is preferably added in the form of an aqueous solution and the amino acid or salt thereof is then preferably mixed before the addition of the peroxy compound. Granulation can be carried out by known methods for those skilled in the art, such as compression, extrusion, agglomeration in a drum or disc, granulation in a fluidized bed, beading or various types of mixing. Optional coating is possible by spraying the particles preferably with aqueous solutions of the compounds used, for example in a drum or in a hovering layer.

The invention also relates to the use of the described peroxy compound-containing amino acid particles as a bleaching agent, preferably in fabric washing or dishwashing. The particles of the invention may be incorporated into the wash water as part of a detergent composition or may be in the form of a separate bleaching powder. Preferably, particles of the present invention are added to the wash water in an amount to provide 0.001 to 1 g active oxygen per liter of wash liquor, corresponding, for example, to 0.01 to 6 g sodium percarbonate.

The invention also relates to a composition comprising an inert filler and / or at least one laundry detergent, the composition further comprising particles comprising a peroxy compound and a carboxylic acid of the invention, for example in an amount of about 1 to about 100% by weight. The composition may comprise a mixture of particles containing different kinds of peroxy compounds. The laundry detergent composition may contain detergent builders, surfactants, alkalinity generating agents, bleach activators, enzymes, or other ingredients conventional in detergent compositions. For example, the detergent builder may be selected from the group consisting of alkali metal or ammonium tripolyphosphates, pyrophosphates or orthophosphates, zeolites such as Zeolite A (e.g. Zeolite 4A), Zeolite B, Zeolite P, Zeolite X or Zeolite HS, Zeolite MAP, silicates such as crystalline layered disilicates (e.g., a compound of formula NaMSi ₊ 1 H ₂ where M is sodium or hydrogen, x number 1.9 to 4 and y number 0 to 20), amorphous disilicates (eg Britesil ™), polycarboxylates, citrates, carbonates, hydrogen carbonates, sesquicarbonates, sulphates, borates and mixtures thereof. The surfactants are preferably selected from the group consisting of anionic surfactants, nonionic surfactants, soaps.

And mixtures thereof. The anionic surfactants are selected, for example, from linear alkylbenzenesulfonates, secondary alkanesulfonates, α-sulfonated fatty acid methyl esters, alkyl sulfates, alcohol ethoxy sulfates, α-olefin sulfonates, alkali metal sarcosinates or alkyl ester sulfonates. Nonionic surfactants are selected, for example, from the group consisting of alkoxylated compounds, for example, fatty alcohols, alkylphenols and alkylamines, alkylpolyglucosides, and polyhydroxy fatty acid amides. The soaps are selected, for example, from the group consisting of sodium or potassium tallow fatty soaps. Cationic surfactants such as quaternary ammonium compounds or imidazolium salts and amphoteric surfactants can also be used. The alkali-generating compounds are selected, for example, from the group consisting of carbonates, silicates, phosphates and mixtures thereof. Bleach activators are, for example, selected from the group consisting of acylated compounds such as tetraacetylethylenediamine (TAED), tetraacetylglucoluril (TAGU), sodium non-noylbenzenesulfonate (SNOBS), and pentaacetylglucose (PAG), and diacetylsulfonic acid (PAG), WO 91/17143). Any inert substances such as sodium sulfate may be used as fillers. The composition may be a ready-to-use detergent composition or a bleaching powder which is added separately during the wash. For example, the enzymes may be selected from the group consisting of amylases, neutral and alkaline proteases of lipase, esterase, and cellulose. Suitably, the complete laundry detergent composition comprises about 1 to about 40, about 10 to 30% by weight of the particles of the present invention. In addition, the composition suitably comprises a detergency builder in an amount by weight of, for example, about 5 to about 50%, a surfactant in an amount of, for example, about 5 to about 35%, an alkali-generating compound in an amount of for example about 5 to about 20%. Preferably, the detergent composition comprises about 5 to about 20% by weight of anionic surfactants, about 2 to about 15% nonionic surfactants, and about 0.1 to about 5% soaps. The detergent composition may also contain bleach activators, for example, about 1 to about 10% by weight, an enzyme, for example, about 0.5 to about 2.5% by weight, and fillers such as sodium sulfate, for example, about 5 to about 50% by weight. It is also possible to incorporate chelating agents such as phosphonates, EDTA, nitrilotriacetic acid (NTA), iminodiacetic acid derivatives or ethylenediamine-N, N-disuccinic acid (EDDS) in an amount of, for example, about 0.1 to about 1% by weight. In addition, the detergent composition may contain conventional ingredients such as waterglass, carboxymethylcellulose, dispersing agents such as polycarboxylic acid homopolymers or copolymers, suds regulators, antioxidants, perfumes, coloring agents, optically brighteners, and water (typically about 3 to about 15% by weight) . The detergent composition may be prepared by known methods such as dry mixing, agglomeration or spray drying. If the preparation involves spray-drying, any heat-sensitive components, such as peroxy compound-containing particles, enzymes, and perfumes, are added to the dried product.

The separate bleaching powder may contain up to about 100% by weight of the peroxy compound-containing particles of the invention, but contains about 5 to about 90% by weight. The bleaching powder may contain only one peroxy compound or a mixture of particles containing different kinds of peroxy compounds. Preferably, a hydrogen peroxide generating agent, such as a peroxycarbonate, contained in an amount of about 10 to about 75% by weight is used in a blend with a bleach activator such as TAED or TAGA in an amount of about 2 to about 25% by weight. Other bleach activators such as diacylated diperoxycarboxylic acids can also be used, for example in an amount of about 2 to about 25% by weight. The bleaching powder may also contain detergent builders, for example, in an amount of about 5 to about 90%, surfactants, for example, up to about 10%, enzymes, for example, up to about 2%, or fillers, for example, 90%. A preferred bleaching composition comprises substantially about 30 to about 75% peroxycarbonate, about 10 to about 25% bleach activator, and up to 100% substantially detergency builders, fillers, surfactants, water, and mixtures thereof.

The detergent dishwashing composition may take the form of a low alkaline detergent composition (the pH of the wash water should be about 10-11) and suitably comprises about 2 to about 15% by weight of the bleaching agent containing the particles of the invention, about 5 to about 50% alkali metal disilicate; about 0 to about 40% alkali metal carbonate about 15 to about 50% builder, such as sodium citrate, polycarboxylate or tripolyphosphate (STPP), about 0.5 to about 5% low foaming surfactant, about 0.5 to about 5% enzymes and about 1 to about 6% bleach activators such as TAED. The detergent dishwashing composition can also be highly alkaline (the pH of the wash water should be about 11-12), having a similar composition to the low alkaline composition, but the disilicate is replaced by about 20 to about 80% alkali metal metasilicate, and the builder is preferably STPP. .

The invention makes it possible to prepare stable bleaching agents containing a peroxy compound, in particular peroxycarbonate, which can be used in detergent compositions containing zeolites, for example Zeolite 4A. The invention also makes it possible to reduce or eliminate EDTA or phosphonates because they are less suitable from an environmental point of view.

The invention is illustrated, but not limited, by the following examples. Unless otherwise stated, the percentages are by weight and are based on the weight of the particles according to the invention as a whole.

DETAILED DESCRIPTION OF THE INVENTION

Example 1

Sodium percarbonate particles with a diameter of about 315 to 1250 µm and a density of about 900 g / l are prepared by granulating fine peroxycarbonate particles in an Eirich rotary drum together with various additives added in the form of aqueous solutions and drying the granules in a fluidized bed. To test the storage stability of the peroxycarbonate, the prepared particles, as well as those from pure sodium percarbonate, are incorporated into a standard detergent composition IEC-Z (Henkel) containing 9.7% linear alkylbenzene sulphonate (with a mean carbon content of 11.5), 5.2%. ethoxylated C 12 -C 18 alcohol (E07), 3.6% sodium soap, 32.5% zeolite 4A, 11.8 sodium carbonate,

5.2% acrylic / maleic acid copolymer sodium salt (Sokolan CP5), 3.4% sodium water glass (3.3 ratio), 1.3% carboxymethylcellulose, 0.3% EDTA, 0.3% optical brightener ( stilbene type), 7.4% sodium sulfate, 12.2% water, 6.5% foam inhibitor (SIK), 0.5% enzyme protease beads (activity 300,000). Samples are prepared from 64 g IEC-Z, 12 g peroxycarbonate particles and 4 g TAED. The quick stability index (QSI) is determined for each sample by measuring the amount of oxygen generated during 24 hours of storage at 40 ° C and dividing the amount of oxygen released by the relative content (in%) of active oxygen in the original peroxycarbonate. Therefore, a low QSI value is evidence of high stability. The results are shown in the table, wherein the contents of the individual components are expressed in percent by weight relative to the particle as a whole. Abbreviations have the following meanings: SPC = sodium percarbonate, GA% sodium glutaric acid, GH = sodium glucoheptonate, AA = sodium adipic acid, PA = pimelic acid sodium, SDS = sodium disilicate, AO = active oxygen, QSI = fast index stability.

SPC GA AA PA AO OSI (T) (4) (T) (4) (%) 100.0 - - - 14.5 5.66 98.0 2.0 - - 14.1 2.64 98.0 - - 14.3 2.09 98.0 - - 2.0 14.1 2.38

Example 2

Sodium percarbonate particles were prepared and tested as in Example 1. The results are shown in the table.

SPC GA GH SDS xgso ₄ AO QSI (4} (4) (D (T) (*) (U 97.2 1.5 - 1.2 o, l 14.0 2.28 97.2 - 1.5 1/2 0.1 14.0 2.59 97.2 0.5 1.0 1.2 0.1 14.1 1.63 97.2 l of 0.5 1.2 0.1 14.1 2.14

Example 3

Sodium percarbonate particles having a diameter of about 315 to 1250 µm and a density of about 900 g / l are prepared by granulating fine particles of percarbonate together with sodium glutarate, sodium disilicate and magnesium sulfate, introduced as aqueous solutions. Granulation is carried out by extruding the mixture of ingredients, crushing the extruded product, rounding the obtained particles on a rotary disk, drying and sieving the rounded particles. For comparison, a glutaric acid-free sample and a sample in which glutaric acid is replaced with EDTA are prepared. Stability is tested after incorporation into the IEC-Z detergent composition as in Example 1 and the results are shown in the table.

SPC GA EDTA SDS MgSO ₄ AO QSI (4) (4) (4) (8) ( «) (T) »9.2 - - 0.67 0.13 14.3 3.4 99.0 - 0.2 0.67 0.12 14.4 3.1 99.0 0.2 - 0.67 0.13 14.4 2.6 99.8 0.5 - 0.67 0.12 14.2 2.1

Example 4

Sodium peroxycarbonate particles with a diameter of about 315 to 1250 µm are coated with a sodium salt of glutaric acid and / or glucoheptonic acid by spraying aqueous solutions in the hovering layer. For comparison, the particles are also coated with benzoic acid and caproic acid. The stability of the particles is tested after incorporation into the IEC-Z detergent composition as in Example 1 and the results are shown in the table.

SPC GA GH AO QSI ( ») (*) ( «) (*) (T) 100 - - 14.5 5.66 95 5 - 13.6 0.65 95 - 5 13.9 0.78 95 4 1 13.6 0.40 95 3 2 13.4 0.31 95 2 3 13.3 0.25 95 1 4 13.6 0.31 95 Benzoic acid 13.8 2.31 95 Capric acid 13.9 2.27

Example 5

Sodium percarbonate particles of approximately 315 to 1250 µm in diameter are coated by spraying aqueous solutions in the float bed first with an aqueous solution of sodium silicate (Si ₂ O: Na ₂ O = 1 ratio), sodium glucoheptonate and / or sodium glutarate and then an aqueous solution. magnesium sulfate and optionally sodium sulfate or sodium bicarbonate. In one case, sodium carbonate is applied as a third solution. The stability of the particles is tested after incorporation into the IEC-Z detergent composition as in Example 1 and the results are shown in the table.

Test 1 (4) Bullet 2 (4) SkiUka 3 (4) Examination 4 (4) sodium percarbonate 85.10 85.10 85.10 85.10 glucoheptonic acid - 0.75 0.75 0.75 glutiric acid 1.50 0.75 0.75 0.75 sodium disilicate 2.00 2.00 2.00 2.00 magnesium sulfate 1.40 1.40 1.40 1.40 sodium sulfate 10.00 10.00 - - sodium bicarbonate - - 10.00 - sodium carbonate - - - 10.00 active oxygen 12.80 12.90 12.80 12.80 QSI * 0.28 0.22 0 0.16

* this value is not given as a percentage

Example 6

Sodium percarbonate particles are prepared by granulation as in Example 3, wherein the particles contain 98.8% sodium percarbonate, 0.12% magnesium sulfate, 0.63% sodium disilicate, 0.5% glutaric acid (as sodium salt) and have a content of of active oxygen 14.2%. The particles were coated as in Example 5 with 1.4% magnesium sulfate, 2% sodium disilicate, 10 sodium carbonate, and 1% glutaric acid (as salt). The coated particles have an active oxygen content of 12.6%. Stability is tested after incorporation into the IEC-Z detergent composition as in Example 1. The observed QSI value for uncoated particles 2.20 and QSI for coated particles 0.04.

Industrial usability

Particles containing a peroxy compound capable of releasing hydrogen peroxide or peroxyacid in aqueous solutions and up to 15% dicarboxylic acid having up to 10 carbon atoms or salts thereof are suitable for incorporation into detergent compositions, particularly for laundry, dishwashing and bleaching compositions.

Claims (29)

PATENT CLAIMS A particle comprising a peroxy compound capable of releasing hydrogen peroxide or peroxyacid in aqueous solutions, characterized in that it contains up to 15% by weight of a C 5 -C 10 dicarboxylic acid or a salt thereof. The peroxy compound-containing particle according to claim 1, characterized in that it contains up to 10% by weight of dicarboxylic acid having 5 to 10 carbon atoms or a salt thereof. The peroxy compound-containing particle according to claim 1 or 2, characterized in that it contains an alkali metal or alkaline earth metal salt of a dicarboxylic acid having 5 to 10 carbon atoms. A peroxy compound-containing particle according to claims 1 to 3, characterized in that it contains a dicarboxylic acid having 5 to 10 carbon atoms or a salt thereof in admixture with the peroxy compound. A peroxy compound-containing particle according to claims 1 to 4, characterized in that it contains a dicarboxylic acid having 5 to 10 carbon atoms or a salt thereof contained in the coating of the particle. A peroxy compound-containing particle according to claims 1 to 5, characterized in that it comprises a dicarboxylic acid of the general formula (I) COOH-R-COOH (I) wherein R is C 3 -C 8 alkylene or alkenylene. A particle comprising a peroxy compound according to claim 6, characterized in that it contains a dicarboxylic acid of the general formula (I) in which R represents a straight-chain group without branching. A particle comprising a peroxy compound according to claim 7, characterized in that it comprises a dicarboxylic acid of formula (I) selected from glutaric, adipic, pimelic, suberic, azelaic, sebacic and mixtures thereof. A peroxy compound-containing particle according to claim 8, characterized in that it contains glutaric acid as the dicarboxylic acid of formula (I). A peroxy compound-containing particle according to claims 1 to 9, characterized in that it comprises a silicate. A peroxy compound-containing particle according to claim 10, comprising an alkali metal silicate. A peroxy compound-containing particle according to claims 1 to 11, characterized in that it comprises a silicate in admixture with the peroxy compound. A peroxy compound-containing particle according to claim 1 to 11, characterized in that the silicate is contained in the coating of the particle. A peroxy compound-containing particle according to claims 1 to 13, characterized in that it comprises a water-soluble magnesium compound. A peroxy compound-containing particle according to claims 1 to 14, characterized in that it comprises a water-soluble magnesium compound. A peroxy compound-containing particle according to claims 1 to 15, characterized in that it comprises a hydroxycarboxylic acid of the general formula (II) R ' _Cn H _m (OH) _n COOH (II), where is R 1 is CH ₂ OH or COOH, n ₂ to 6 amOn, or a salt thereof. A particle comprising a peroxy compound according to claim 16, characterized in that it contains a hydroxycarboxylic acid of the general formula (II), in which R 'is CH ₂ OH, n 4 or 5 am the same number as n or 0 to n or a salt thereof. A particle comprising a peroxy compound according to claim 17, characterized in that it comprises a hydroxycarboxylic acid of the general formula (II) which is glucoheptonic acid. A peroxy compound-containing particle according to claims 1 to 18, characterized in that it comprises a hydroxycarboxylic acid of the general formula (II) mixed with the peroxy compound. A peroxy compound-containing particle according to claims 1-8, characterized in that it comprises a hydroxycarboxylic acid of the formula (II) contained in the coating. A peroxy compound-containing particle according to claims 1 to 20, characterized in that it contains a dicarboxylic acid of 5 to 10 carbon atoms of the formula (I) and a hydroxycarboxylic acid of the formula (II) in admixture with the peroxy compound. A peroxy compound-containing particle according to claims 1 to 20, comprising a dicarboxylic acid having 5 to 10 carbon atoms of the general formula (I) and a hydroxycarboxylic acid of the general formula (II) in the peroxy compound coating. A peroxy compound-containing particle according to claims 1 to 22, characterized in that it contains sodium peroxycarbonate as the peroxy compound. 24. The peroxy compound-containing particle according to claim 1, having a density of 800 to 1500 g / l. A peroxy compound-containing particle according to claim 24 having a density of 800 to 1100 g / l. Use of a peroxy compound-containing particle according to claims 1 to 25 as a bleaching agent in detergent compositions. A composition comprising an inert filler and / or at least one laundry-active substance, comprising a peroxy compound-containing particle according to claims 1 to 25. 28. A detergent composition comprising a peroxy compound-containing particle according to claims 1 to 25. 29. A detergent composition according to claim 28 comprising a zeolite builder.